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Frederic Lehne announced that he's heading to the set starting this week to reprise his role as Supernatural's original bad guy, Azazel, aka the Yellow-Eyed Demon. Dean killed the YED with the Colt at the end of season 2 with an assist from the ghost of John Winchester. Azazel made additional appearances later in flashbacks or time travel episodes when we saw him possess Sam and Dean's grandpa as well as a priest.

Combined with the news that Mitch Pileggi is returning for multiple episodes, this raises some serious questions about what the heck is going on in Supernatural season 6. It sounds like they're reopening all of the original mythology, possibly offering a more detailed explanation about Azazel's master plan to free Lilith and open Lucifer's cage. We could also learn more about the special children who were so crucial to season 2.

Whatever the reason, I'm getting very excited about season 6. Instead of starting over, it looks like new showrunner Sera Gamble is going to be using a lot of the existing mythology and I can't wait to see how Azazel returns.